Revert "serial: 8250: Make SERIAL_8250_RUNTIME_UARTS work correctly"

Revert "serial: 8250: Make SERIAL_8250_RUNTIME_UARTS work correctly"

This reverts commit d8537401d27897a966bc4d8089cd0c379abb72f3.

This regresses a longstanding behaviour on X86 systems, which end up with
PCI serial ports moving between ttyS4 and ttyS0 when you bisect to opposite
sides of this commit, resulting in the need to constantly modify the console
setting in order to bisect across it.

Please revert, we can work on solving this for ARM platforms in a less
disruptive way.

Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
Cc: Karthik Manamcheri <karthik.manamcheri@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>